21.15% is the change from 260 to 315
Calculation steps:
[( 315 - 260 ) ÷ 260] x 100 = 21.15%
Formula
Percentage change = [(315 - 260) / 260] x 100
Subtract the new number by the original number
315 - 260 = 55
55 ÷ 260 = 0.21153846153846154
0.21153846153846154 x 100 = 21.15%